> Call me crazy but I wonder if my accurate relative period of time > could be derived from the 230VAC 50Hz mains supply over here. Now, > before you yell at me, consider this, I have a couple of mains driven > clocks in the house and only seem to need to change the time on them > when we go from Standard Time to Daylight Saving Time. Agreed, the > instantaneous frequency of the mains is not always spot on but the > long term average seems to be kept pretty accurate or we would all > have to keep changing our mains timed clocks. If I knew the standard > deviation of the mains, I could probably calculate the period of time > I'd have to gate my breadboard "frequency counter" to achieve a > certain accuracy. > > 73, Steve
For standard (or Allan) deviation of mains frequencies, see: <Accuracy and stability of the 50 Hz mains frequency> http://wwwhome.cs.utwente.nl/~ptdeboer/misc/mains.html <60 Hz AC Mains Frequency Accuracy Measurement> http://www.leapsecond.com/pages/mains/ /tvb _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
